The school was not far from the police station, and Du Jingshan quickly brought the reagents and microscope needed for the tests on his bicycle.
The principle of blood typing is very simple: first, drop the blood to be tested onto a glass slide, and then drop anti-A serum and anti-B serum onto the glass slide respectively.
If blood agglutinates with type A serum, it is type A blood; if it agglutinates with type B serum, it is type B blood. If both agglutinate, it is type AB; if neither agglutinates, it is type O.
Everyone in the room stared at Du Jingshan with the same curiosity they had for a spectacle.
In this era, people's level of education was generally low. Many people had only attended literacy classes and could not even read books and newspapers, let alone understand the professional knowledge of blood testing.
Li Xiyue kept a close eye on Du Jingshan's every move. If Du Jingshan dared to help Li Yin fabricate evidence, then Du Jingshan would undoubtedly be the spy who killed Mu Cangnan!
The most regrettable thing is that DNA testing was not available in China at that time.
DNA paternity testing technology was invented by British geneticist A.J. Jeffries in 1984, and the technology was only brought back to the UK when she died.
However, to her surprise, Li Yin's face did not show the panic she expected, but rather a confident and arrogant expression, and she even gave her a sinister look!
Jin Cuicui's expression was correct; it was a forced calm, but her eyes betrayed an unconcealed panic.
Seeing that Du Jingshan was ready, Captain Liu asked, "Which of you two will do the tests first?!"
Li Yin quickly said, "I'll get the tests done first!"
She reached out her hand as soon as she finished speaking, giving Li Xiyue no chance at all.
Du Jingshan took out an alcohol swab and wiped Li Yin's fingertip. He then pricked it with a lancet, and a drop of blood immediately appeared on Li Yin's fingertip.
A sudden burst of heated discussion erupted from the crowd.
"I think this girl must be their biological child! Otherwise, why would they dare to be the first to get tested?!"
"Yes! It must be a freshman; only then will they have the confidence!"
"Tsk tsk! I think Cheng Xiaohui hasn't given up. She created a fake daughter to frame her own nanny in order to get back into the Li family!"
Li Xiyue reached out and grabbed Cheng Xiaohui's hand. Cheng Xiaohui's hand was icy cold and trembling.
She could sense the psychological pressure Cheng Xiaohui was under.
She lowered her voice and said to Cheng Xiaohui, "Mom, don't worry, true gold fears no fire!"
Cheng Xiaohui nodded vigorously; she believed that Li Xiyue was her biological daughter.
Even though they didn't have a blood test after Li Xiyue returned, the feeling of being connected by blood couldn't be wrong.
Everyone's eyes were fixed on the glass slide, completely unable to understand the changes in the blood on it.
A moment later, Du Jingshan said, "The blood test is complete. Li Yin's blood type should be O."
The entire office fell silent as everyone turned to look at Li Wenbo.
Captain Liu asked, "Li Wenbo, do you know your blood type?"
Li Wenbo nodded and said, "I know my blood type. I donated blood when the country called for it."
Captain Liu asked, "What's your blood type?"
Li Wenbo said, "I have type O blood."
As soon as he finished speaking, it was like a drop of water falling into a pan of oil, and the entire office instantly erupted!
The onlookers shouted, "That girl is a liar! Cheng Xiaohui is a liar! Li Yin is her biological daughter!"
"Li Yin is the biological daughter! She shares the same blood type as her father!"
"Captain Liu, arrest these swindlers immediately!"
"Pah! How shameless! It's one thing to cheat on your husband, but to bring a fake daughter to frame the nanny and want to go back to her ex-husband's house, what are you up to!"
Jin Cuicui's originally panicked face inadvertently revealed a look of surprise. She thought it was all over this time, but she never expected to turn the tide!
She slapped her thigh and said, "It's all my fault for giving birth to such a wicked daughter!"
"Captain Liu, sentence her! I will never plead her innocent! Give her the heaviest sentence possible, so she can stay in the Northwest Prison and not come out to harm others!"
With tears welling up in her eyes, Li Yin said to Li Wenbo, "Dad, I'm your biological daughter! I didn't lie to you! I think Li Xiyue doesn't need a blood test anymore! She's definitely a liar!"
Mu Jiuhong said, "Arrest the swindlers! They must be sentenced!"
Cheng Xiaohui's vision went black, as if a hand had pulled all the strength out of her body from the back of her neck, and her body went limp and she fell backward.
Li Xiyue quickly helped her mother up and put the medicine she had prepared into her mother's mouth.
She whispered in her mother's ear, "Mom, don't panic! The best is yet to come, good things come to those who wait!"
After taking the medicine, Cheng Xiaohui's heart returned to normal, and she slowly nodded.
Although she had regained her senses, she was still too weak to catch her breath and didn't even have the strength to speak.
Li Xiyue helped her mother sit down in a chair and said to Captain Liu, "Give me a blood test! How can you be so sure she's my biological daughter without even giving me a blood test?"
Captain Liu said, "Principal Du, why don't you get Li Xiyue's blood tested too? If she's also blood type O, then it's not certain who Li Wenbo's biological daughter is!"
Honestly, he favored Li Xiyue. He had met this girl, and she was kind-hearted, filial, and compassionate. She didn't seem like a con artist at all!
Li Xiyue raised her hand, and Du Jingshan took blood from her fingertip and dripped it onto a glass slide.
Everyone's eyes were fixed on the glass slide, as if they wanted to see right through it.
Cheng Xiaohui looked anxiously at the slide, then at Li Xiyue. Her hands trembled uncontrollably. He had been wronged for so many years, and she couldn't bear to see her daughter wronged again!
Jin Cuicui stood quietly behind Li Yin and whispered in Li Yin's ear, "What should we do? We've had her tested too. What if she's also blood type O..."
Li Yin clenched her teeth, the words escaping from the corner of her lips, "What a coincidence, is it blood type O?"
She knew from a young age that she wasn't Li Wenbo's biological daughter. Perhaps it was because she felt guilty, but she was never at peace.
When she grew up, she heard that blood type testing could determine parentage, so she secretly went to the hospital to get her blood type tested.
I never expected that my blood type was exactly the same as Li Wenbo's!
She thought it must be God's help that made it such a coincidence that she had the same blood type as Li Wenbo.
She was the first to get her blood tested because she wanted to find out her own blood type, so she wouldn't let Li Xiyue get hers tested!
Time seemed to move incredibly slowly as people waited anxiously; the clock on the wall appeared to stand still.
As expected, Li Xiyue heard Du Jingshan reveal her blood type.
"Li Xiyue's blood type is B!"
As soon as Du Jingshan finished speaking, the entire office seemed to explode again!
Jin Cuicui jumped up and down, shouting, "Sentence her! Sentence her! Sentence her to death!"
The mother and daughter won!
We finally won! Hahaha!!
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